Well, I was only passing the time of day while waiting for my wife, so I scanned the Polo using Carista - really just looking out for a repeat of the "compressor control" fault that was logged a month or so ago which is meant to get sorted out by a S/W update from VW dealer - that is if it returns!
Anyway, what I discovered was fault code 5688 stored in the Multimedia System, which translates into "B13C9 F2 [008] - On/Off Switch, Intermittent" - I have never noticed any problems with that switch, so maybe this is another example of "not quite right" S/W?
Anyone else noticed this fault, I confirmed it using VCDS, so it is real.